Improvement in dies for heading bolts



0. KANE. DIE FOR HBADING BOLTS.

No. 73,728. Patented Jan. 28, 1868.

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CHARLES KANE, OF PITTSBURG, PENNSYLVANIA Letters-Patent Iva-73,728, dated January 28,- 1.8 68; antedated January 16, 1868. i

IMPROVEMENT 1n mes roe READING BOLTS.,

castrate were in in tigers Jitters 33min tut naking ant, at flgrsams.

TO ALL WHOM 'IT MAY CONCERN:

I Be it known that I, CHARLES KANE, of the city of Pittsburg, in the county of Allegheny, and State of Pennsylvania, have invented certain Improvements in Ledge-Dies for-Starving Bolts; and I do hereby declare that the following. is a. full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, in which- Figure 1 is a view of the face of one of myirnproved dies, and die'with which it is combined.

Figure 2 is an oblique geometrical view of my dies, seen from the side.-

Figure 3 is a view of the face of the common ledge-die; and

Figures 4, 5, and 6 are views of my improved ledge-dies, illustrating their working; v

This invention relates to that class of (lies having a ledge or. shelf used for confining the iron'in the process of griping and staring bolts, and it consists in the peculiar shapeof the-ledge, as hereafter'deseribed.

To enable others skilied in the art to make and use my invention, I will proceed to describe its construction and operation.- i

A is the-ordinary half round griping-die, which I use in connection with my improved dies. B and C are my improved die s, which are made as ordinary ledge-dies, so far as regards their fa-ce, D, which is perpendicular to the plane of motion of the die, 'but whichhave a ledge of..a. difl'erent form than theone hitherto made,'a.nd which operatein such a manner as to form a better bolt. Theface of my improved ledge, which serves the purpose of keeping the iron from spreading during the process of 's'tmn'ng and griping, is a plane surface, parallel to the line of motion of the dies in the direction of said movement, but forming an angle with said line of motion, if measured in a right-ungle direction with it, so that when the dies are brought together the space left between them'will he the same width all-'over i'f measured horizontally from'f to g'andfrom 71, to t} but if measured'vertically, will begrcater from it too and t to P, than fromfto M andg'to s. i

The object of this construction isillustrated in my figs. 4, 5, and 6,- where fig. 4 represents the iron during its first operation, fig. 5 represents the position in which the iron is turned before the second operation, and fig. 6 illustrates the action of a second pressure of the griping-dies on the iron.

It is casily understood those skilled in the art of staving bolts, that the additional amount of metal which nay-dies allow to expand near the place where the shape of the boltn's changed froni round to square, will enable me to obtain much sharper and better-defined corners to that part, and a much handsomer bolt.

Disclaiming any novelty in any part of what I have described, which is not my intention to claim 'What I do claim as my invention, and desire to secure by LettersPate nt of the United States, as my improvementin bolt-pressing andstaving machinery, is-

The inclining of the plane of the ledges inthe direction of the gripiug-dies, and from the axis of the bolt, in combination with pressing surfaces parallel to the axis of the bolt, as specified.

CHARLES KANE. Witnesses J. Donnnnson,

FRANCIS L. CLARK. 

